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Note that the following lectures include animations and PowerPoint effects such as fly ins and transitions that require you to be in PowerPoint\'s Slide Show mode (presentation mode). The Formation of Stars. Chapter 11. Guidepost.

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Previous chapters have used the basic principles of physics as a way to deduce things about stars and the interstellar medium. All of the data we have amassed will now help us understand the life stories of the stars in this chapter and those that follow.

In this chapter, we use the laws of physics in a new way. We develop theories and models based on physics that help us understand how stars work. For instance, what stops a contracting star and gives it stability? We can understand this phenomenon because we understand some of the basic laws of physics.

Throughout this chapter and the chapters that follow, we search for evidence. What observational facts confirm or contradict our theories? That is the basis of all science, and it must be part of any critical analysis of what we know and how we know it.

1. Ancient astronomers, philosophers, and poets assumed that the stars were eternal and unchanging. Is there any observation they could have made or any line of reasoning that could have led them to conclude that stars don’t live forever?

11. The gestation period for humans is 40 weeks. What was the gestation period for our Sun; that is, how much time passed between the onset of gravitational collapse and the Sun\'s arrival on the main sequence?